The difference between telecom prl50 1 and 500.

PRL50 1 is mainly used for international roaming. It contains a predefined list of roaming partners. When the user arrives at a new roaming area, PRL50 1 will automatically search and select the roaming network with the best signal. PRL500 is mainly used to manage the spectrum resources of operators, which is a more complicated mechanism, allowing operators to manage their own spectrum resources according to different priorities and strategies.

PRL50 1 focuses mainly on users' experience in international roaming, while PRL500 focuses more on operators' management and optimization of their spectrum resources.